Mr Kim

Mr Kim was a Caretaker and Security Guard who worked at Green Home. He is the first character Hyun meets there, and one of the first characters to show signs of becoming a monster.

Biography
Mr Kim was hired as the security guard for Green Home, but was burdened with other tasks from the residents. One resident scolded him for sweeping (when another resident had asked him to) as it was "getting dust everywhere". A second resident later told him to get rid of the bed in the security office, because he believed it was why he fell asleep at work so much. Mr Kim argued that without the bed, he couldn't get any rest, but he was informed that he wasn't supposed to.

Mr Kim was cutting the grass outside Green Home when a blade hit a rock and flew into a tree, nearly injuring Hyun. The two has a conversation about Hyun's circumstance, ending in Mr Kim asking that he come to his office later to explain a few things about the Apartment building. Shortly after, he wiped his nose, noticing it was bleeding. The resident who previously scolded him for sweeping gave him a box of food that her relative sent her, because she had too much. When Mr Kim opened the box, it had turned out to be filled with rotten fish.

Shortly after, he went back inside to the security office and locked down the building, muttering that the residents all deserved to die. One resident came in to ask him what he was doing, and he twisted his neck backwards and murdered him with the grass cutter. He had also realised that he forgot to lock the door to the roof.

He came to Hyun's apartment to explain a problem with the construction company, and to ask him not to sign anything, should anyone come to his door. He offered Hyun a bottle of orange juice as a welcome present, before going on to lock the door to the roof.

At some point, he had managed to murder two more people and get inside the elevator with a gas canister as he was planning to burn the building down. However, his weight caused the elevator to be too heavy for him to take the gas canister with him, so he left it behind on the 15th floor. When the power came back on, the elevator went back to the bottom floor He transformed himself into a monster even further, and killed the woman who gave him rotten fish, and another resident. As he killed them, he counted them, going up to five at this point. He prepared to kill Eun, but Jayhun distracted him, and flashed him with his shield. Jayhun attempted to ram him down, but Mr Kim didn't move and threw him against a wall, shattering his ribs with ease. Mr Kim walked over and then killed Jayhun as well, increasing his total to six. He went back to kill Eun before Seop came to protect her, and then Hyun to fight as well. Mr Kim flung Hyun to Jayhun's dead body. As Jisu dragged Hyun, distraught by seeing Jayhun, Mr Kim approached them, ready to kill Hyun. Hyun stood up and grabbed the tongue of the Tongued Monster, as it burst through the wall behind Jisu, and jammed it into Mr Kim. The Tongued Monster killed Mr Kim by absorbing him, letting Jisu bash his head in to finish the job. The survivors burned his body, preventing him from coming back to kill them again.

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